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Research on distribution, movement and accumulation of marine debris using satellite data

利用卫星数据研究海洋垃圾的分布、移动和堆积

基本信息

批准号：
12640425
负责人：
KUBOTA Masahisa
金额：
$ 1.98万
依托单位：
TOKAI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

We collected drifting buoy data and compared ocean surface flow fields derived from the buoy data with those derived from satellite data in order to confirm accuracy of satellite-derived ocean surface flow. We used drifting buoy without a drogue in the present study because we are interested in only surface flow. Basic flow patterns are consistent with each other. However, the values derived from satellite-derived data are extremely low compared with buoy-derived data. Because satellite date are considerably smoothed and a drifting buoy generally tends to concentrate in a strong current region. There are large differences between each flow field in the southern hemisphere compared with the northern hernisphere. The large difference may be caused by low density of drifting data in the southern hernisphere. Moreover, we investigated movement of marine debris discharged from big cities in the world. There are two ways of the movement of the marine debris discharged from Japan. Most marine debris move eastward by the Kuroshio, Kuroshio Extension and North Pacific Current. Parts of marine debris move southwestward by the Kuroshio Countercurrent. Moreover, we investigated an effectiveness of data assimilation for prediction for location of marine debris. The objective analysis method used in the data assimilation method is a successive correction method. We can predict buoy location after one month within 300 km if we use data assimilation. However, the prediction results strongly depend on the density of buoy data.

我们收集了漂流浮标数据，并将浮标数据得出的海面流场与卫星数据得出的海面流场进行了比较，以确认卫星数据得出的海面流动的准确性。在本研究中，我们使用不带浮筒的漂流浮标，因为我们只对表面流动感兴趣。基本流型是相互一致的。然而，与浮标数据相比，卫星数据得出的值非常低。因为卫星数据相当平滑，漂移的浮标通常倾向于集中在强流区域。与北半球相比，南半球各流场差异较大。这种巨大的差异可能是由于南半球漂移数据密度较低造成的。此外，我们还调查了世界各大城市排放的海洋垃圾的移动情况。从日本排出的海洋垃圾有两种移动方式。大多数海洋垃圾通过黑潮、黑潮延伸部和北太平洋洋流向东移动。部分海洋垃圾被黑潮逆流向西南方向移动。此外，我们还研究了数据同化在海洋垃圾位置预测中的有效性。数据同化方法中使用的客观分析方法是逐次改正方法。如果使用资料同化，可以预测一个月后300公里范围内的浮标位置。然而，预测结果很大程度上依赖于浮标数据的密度。